Door bolt



July 1, 1941. P, LAZARIDES 2,247,556

DOOR BOLT Filed Aug. 9;, 1938 10 INVENTOR. g1 Pinion Lazarzdes ll 1 BY71 g7 ORNEY.

Patented July 1, 1941 UNITED STATS ATE;

. .FFHCE 3 Claims.

This invention relates to bolts for securing doors, windows, blinds, andthe like, and the object is to provide a structure capable of beingstamped entirely from sheet metal with the least number of parts at lowcost and requiring no machining or assembly operations, and capable ofmanufacture in any size and weight serviceable for light and heavy duty.

In carrying my invention into eifect I have devised a closure fastenerhaving three parts, i. e., a bolt casing, a bolt and keeper all stampedfrom sheet metal. The casing is stamped from a single piece to form asemi-cylindrical body with laterally projecting fastening flanges,bearing lugs for retaining the bolt within the casing and for preventingthe bolt from coming into contact with the surface to which the casingis secured, and a spring blade having three functions, i. e., forfrictionally engaging the bolt; for preventing withdrawal of the boltfrom the casing, and for holding the bolt in the unlocked position. Thebolt is also stamped from a single piece into semi-cylindrical form tofit and slide within the casing body, and with an arched leading edge ornose to facilitate entrance into the keeper, a tail piece to form anoperating knob, and an indentation to be engaged by the spring blade ofthe casing to prevent withdrawal of the bolt and to hold the bolt in theunlocked position. The keeper is also stamped from a single piece with asemi-cylindrical part for engaging the bolt, laterally projectingfastening flanges, and lugs for engaging the bolt to prevent loose fitor play of the bolt within the keeper and to prevent rubbing contact ofthe bolt on the surface to which the keeper is secured.

My invention is illustrated in the accompanying drawing as applied to asmall bolt for light duty, and in which- Figure 1 is a plan view of thebolt, casing and keeper in the locked position.

Figure 2 an end View of the keeper and bolt as viewed from the righthand end of Figure 1.

Figure 3 an end view of the casing and bolt as viewed from the left handend of Figure 1.

Figure 4 a bottom plan view of the bolt, casing and keeper.

Figure 5 a longitudinal vertical section on the line 55 of Figure 1 withthe bolt in the retracted position.

Figure 6 a plan view of the bolt blank before shaping.

Figures '7 and '7 are respectively plan and edge views of the casingblank before shaping, and

Figure 8 a plan view of the keeper blank before shaping.

Referring to the drawing, and more particularly to Figure 1, in whichthe three parts of the device are shown assembled in the lockingposition, I indicates the bolt, 2 the bolt casing, and 3 the keeper.

The bolt is blanked out from sheet metal of the desired gauge in theform of a flat strip I having a curved end l tail piece I, andrectan-gular cuts I as illustrated in Figure 6. This blank is formedinto a semi-cylindrical body as seen in Figure 5 to form the bolt 1having an arched leading end or nose 4, and the tail piece is bent toform the operating handle or knob 5 of any desired shape, but preferablyis bent into circular form as shown in Figure 5, and for large heavyduty bolts the ring 5 will be closed into contact with the back of thebolt and welded. In forming the bolt, the section formed by therectangular cuts l is bent inward to approximately the thickness of themetal to form the indentation 6, Figures 4 and 5, for the purposehereinafter mentioned. This operation completes the forming of the boltand requires no further shaping or machining to fit it into slidingposition within the casing.

The casing is blanked out from sheet metal in the form of a fiat strip2*, Figures 7 and 7 with screw holes I, semi-circular or U-shaped cutsto form lugs 8 which project laterally toward the longitudinal center ofthe plate, and an elongated U-shaped perforation extendinglongitudinally at the center of the plate and forming a spring blade ortongue 9. This blank is bent into finished shape by a forming die whichimparts to the blank the semi-cylindrical body part 2 and the fasteningflanges 2 and in the same operation the tongue 9 is given an inward bendso that it projects approximately the thickness of the metal below theinner surface of the body part 2 as seen in Figure 5. In the sameoperation of the die while imparting the semi-cylindrical form to thebody part 2, lugs 8 are forced back into the plane of the flanges 2 sothat in the finished casing the lugs will project inward toward thelongitudinal center of the body part 2 in the same plane as the flanges2 as see-n in Figure 3.

The arcs of the formed bolt and easing are struck from the same center,and the radius of the bolt arc is such that it will have a sliding fitin the arc of the casing and will be held in sliding contact therewithby the lugs 8 which also serve as bearings for the bolt. It will beobserved that by this construction and assembly the bolt will not onlyhave a smooth sliding fit within the casing, but since the lugs 8 are inthe same plane as the casing flanges, the bolt will not come intocontact with the door or other surface to which the casing is secured.The purpose of the tongue 9 of the casing is to serve as a pressurespring on the bolt to retain it in either the locked or unlockedposition, and by abutting against the shoulder formed by the indentation6 prevents withdrawal of the bolt from the casing as seen in Figure 5.

The keeper 3 is blanked from sheet metal of the same gauge as the casingin the form of a flat strip 3 Figure 8, with screw holes Iii and lugs II corresponding to the screw holes and lugs 'I and 8 of the bolt casing.The lugs I I project inward and downward as in the casing blank, as seenin Figure 7 and when the blank is shaped by the forming die into thesemi-cylindrical body 3 with fastening flanges 3 Figure 2, the lugs IIare forced back into the plane of flanges 3 as seen in Figure 2. Thepurpose of the lugs on the keeper is to insure a close sliding fit forthe end of the bolt in the keeper and without the bolt contacting withor marring the surface to which the keeper is secured.

It will be observed by reference to Figure 5, that in sliding the boltinto locking position, if the surface to'which the casing is secured isout of alignment with the surface to which the keeper is secured asindicated in Figure 5, the curved nose of the bolt will wedge into thekeeper to force the bolt casing into alignment with the keeper, anditwill be noted that the arc and length of the nose is such that thesemi-cylindrical part of the bolt will be within the near edge of thekeeper before the leading edge of the bolt reaches the near edges oflugs I I so that the bolt will be free to slide over the lugs and fullyinto the keeper without interference with the lugs, and will be held inthe keeper against lateral movement therein. Also it will be noted thatin forming the bolt from a fiat sheet of metal into the semi-cylindricalform with the curved nose, the outer edge of the metal is drawn upforming a bevel as indicated at I2 in Figures 2, 3 and 5, and that dueto this bevel and the curve of the nose the bolt will readily slide upon the lugs II of the keeper in case the keeper and bolt casing are outof alignment oppositely to the un alignment indicated in Figure 5.

From the foregoing it will be seen that I have produced a door bolt ofthe fewest possible number of parts of minimum weight for a given sizebolt, and of maximum strength due to its hollow arched form, and capableof being manufactured in any desired size for a large variety of uses atminimum cost.

What I claim is:

1. In a door bolt, the combination of a casin the bolt, and the boltshaped into semi-cylindrical form enclosed by and having a sliding fitwithin the casing and having a curved leading edge, a tail piece toserve as the operating knob, and an indentation positioned forengagement by said tongue to check withdrawal of the bolt from thecasing.

2. A door bolt comprising a casing and bolt made of sheet metal, thecasing being a single piece formed into a semi-cylindrical body havinglaterally projecting fastening flanges, a tongue forming a pressurespring and detent integral with said body part and bent slightly inwardto serve as a retarding spring blade for the bolt, and lugs integralwith said body part and projecting inward in the same plane as saidflanges, and a bolt formed from a single piece into a semi-cylindricalbody whose cross-sectional dimension is such as to provide a sliding fitwithin said casing body and retained in sliding contact by said lugs,and said bolt having an arched leading edge, a tail piece formed into anoperating knob, and a longitudinal indentation forming a shoulderpositioned for engagement by the tongue of the casing body to checkwithdrawal of the bolt from the casing. V

3. In a door bolt as defined in claim 1, a casing comprising asubstantially rectangular plate shaped to form a semi-cylindrical bodyextending longitudinally the entire length of the plate with laterallyprojecting fastening flanges perforated with screw holes, a U-shaped outout on the semicylindrical part of the body forming a tongue extendinglongitudinally thereof, and a plurality of U-shaped cuts at both sidesof the longitudinal center of the body forming lugs projecting inward inthe same plane as said flanges.

PLATON LAZARIDES,

